Injection mould with hot runner manifold

Abstract

To simplify the cleaning of hot runner feed lines, and consequently to reduce the downtimes, an injection mold with at least one central feed line and a number of plates arranged one above the other is proposed. The injection mold has at least one hot runner feed line with one or more branching points, at which the hot runner feed line changes direction and/or is divided. In each plate, the hot runner feed line runs in a straight line from the upper surface of a plate to the lower surface of the plate. These hot runner feed lines run straight and at an angle within the plate. At least on one side, the hot runner feed lines open out into exchangeable inserts. For cleaning the injection mold, the exchangeable inserts can be removed from the plates and cleaned separately, while the straight-running hot runner feed lines can be mechanically cleaned in a conventional way.

The invention claimed is: 
     
       1. An injection moulding tool ( 1 ) comprising: at least one central feed conduit ( 2 ), at least two plates ( 3 ,  4 ) arranged one over another and each including at least one hot runner feed conduit ( 5 ) with a branching point at each end, in which a direction change and/or a division of the at least one hot runner feed conduit ( 5 ) is affected, for feeding a hot injection moulding mass to two or more cavities ( 6 ), the at least one hot runner feed conduit ( 5 ) in each of the two plates ( 3 ,  4 ) of the injection moulding tool ( 1 ) running in a straight line from an upper plate surface ( 7 ) to a lower plate surface ( 8 ) and inclined between the upper plate surface ( 7 ) and the lower plate surface ( 8 ) and running out into exchangeable inserts ( 10 ) at least at one of the upper plate surface ( 7 ) and the lower plate surface ( 8 ), and in the inserts the division or the direction change of a corresponding hot runner feed conduit ( 5 ) is affected. 
     
     
       2. An injection moulding tool ( 1 ) according to  claim 1 , wherein the at least one central feed conduit ( 2 ) runs vertically in a sprue bush ( 20 ) and runs out into a first, exchangeable insert ( 10 ) which is recessed in a flush manner in the upper plate surface ( 7 ) of an upper of the two plates ( 3 ) which is located below the central feed conduit ( 2 ), and wherein the exchangeable insert ( 10 ) is formed as a manifold insert ( 11 ). 
     
     
       3. An injection moulding tool ( 1 ) according to  claim 2 , wherein at least two hot runner feed conduits ( 5 ) run from the first exchangeable insert ( 10 ) which is recessed in a flush manner in the upper plate surface ( 7 ) of the upper of the two plates ( 3 ), in a straight and inclined manner through the upper of the two plates ( 3 ) and run out into exchangeable inserts ( 10 ) at the lower plate surface ( 8 ) of the upper of the two plates ( 3 ) which are recessed in a flush manner there, and the inserts are manifold inserts or deflection inserts ( 11 ,  12 ). 
     
     
       4. An injection moulding tool ( 1 ) according to  claim 1 , wherein a manifold insert ( 11 ) is recessed in a flush manner in the upper plate surface ( 7 ) of each of the two plates, and deflection inserts ( 12 ) are in each case recessed in a flush manner in the lower plate surface ( 8 ) of each of the two plates ( 3 ,  4 ). 
     
     
       5. An injection moulding tool ( 1 ) according to  claim 1 , wherein the exchangeable inserts ( 10 ) are non-positively and/or positively held in each of the two plates ( 3 ,  4 ). 
     
     
       6. An injection moulding tool ( 1 ) according to  claim 1 , wherein the exchangeable inserts ( 10 ) comprise side surfaces running perpendicularly to the lower or the upper plate surfaces ( 7 ,  8 ) of each of the plates ( 3 ,  4 ). 
     
     
       7. An injection moulding tool ( 1 ) according to  claim 1 , wherein each of the exchangeable inserts ( 10 ) include at least one side wall which serves as a run-out surface or an exit surface ( 13 ) and which is in contact with one of the hot runner feed conduits ( 5 ) running in an inclined, manner, and which is inclined to run perpendicularly to a running direction of a corresponding hot runner feed conduit ( 5 ). 
     
     
       8. An injection moulding tool ( 1 ) according to  claim 1 , wherein perpendicularly running ejection bores ( 14 ) which run out in recesses ( 30 ), in which the exchangeable inserts ( 10 ) are mounted, are incorporated in each of the two plates ( 3 ,  4 ). 
     
     
       9. An injection moulding tool ( 1 ) according to  claim 8 , wherein the ejection bores ( 14 ) have an inner thread, in which an ejection screw ( 15 ) can he inserted, by which the exchangeable insert ( 1 ) is held on a corresponding one of the plates ( 3 ,  4 ) by three or for cleaning can be ejected out of the corresponding one of the plates ( 3 ,  4 ), in which the exchangeable insert ( 10 ) is mounted. 
     
     
       10. An injection moulding tool ( 1 ) according to  claim 1 , wherein the exchangeable inserts ( 10 ) are manufactured of metal in a machining manner. 
     
     
       11. An injection moulding tool ( 1 ) according to  claim 1 , wherein the exchangeable inserts ( 10 ) are sintered or cast from a metal. 
     
     
       12. An injection moulding to ( 1 ) according to  claim 1 , wherein the exchangeable inserts ( 1 ) are of ceramic. 
     
     
       13. An injection moulding tool ( 1 ) according to  claim 9 , wherein the exchangeable inserts arc designed and mounted symmetrically to a longitudinal axis of the ejection bore, and the ejection screw ( 14 ) is thus directed to a center of the insert. 
     
     
       14. An injection moulding tool ( 1 ) according to  claim 4 , wherein one of the deflection inserts ( 12 ) of the lower plate surface ( 8 ) of an upper plate of the two plates ( 3 ) is connected to the manifold insert ( 11 ) in the upper plate surface ( 7 ) of a lower plate of the two plates ( 4 ). 
     
     
       15. An injection moulding tool comprising:
 at least one central feed conduit; 
 a first plate having a first plate upper surface and a first plate lower surface, and including at least one first plate hot runner feed conduit extending through the first plate in a straight line and inclined between the first plate upper surface and the first plate lower surface; 
 a second plate having a second plate upper surface and a second plate lower surface, and including at least one second plate hot runner feed conduit extending through the second plate in a straight line and inclined between the second plate upper surface and the second plate lower surface, the second plate being arranged under the first plate; 
 a plurality of exchangeable inserts each adapted to affect a division and/or a direction change of a hot injection moulding mass through the injection moulding tool, wherein each of the at least one first plate hot runner feed conduit and the at least one second plate hot runner feed conduit includes a first end and a second end each connected to one of the plurality of exchangeable inserts to feed the hot injection moulding mass to two or more cavities. 
 
     
     
       16. An injection moulding tool according to  claim 15 , wherein the second plate comprises two straight and inclined second plate hot runner feed conduits, and the plurality of exchangeable inserts includes a deflection insert recessed in a flush manner in the first plate lower surface, and a manifold insert recessed in a flush manner in the second plate upper surface and connected to each of the two second plate hot runner feed conduits of the second plate, wherein the deflection insert connects to each of the two second plate hot runner feed conduits via the manifold insert to pass the hot injection moulding mass from the first plate to the second plate.